MythTV uPnP server fails on a backend-only rpm-based installation.

This has recently come up on the mythtv-users list.  It probably affects 
all rpm-based repos.

http://www.gossamer-threads.com/lists/mythtv/users/583439#583439

The uPnP server needs devicemaster.xml, which is built into the frontend 
rpm package although in the source code it's in mythtv/programs/mythbackend.

It doesn't seem to be used by the frontend code.